When you start sleep training or following more stringent guidelines around wake/sleep times?

Hi all,

My daughter is 2 weeks old and I was wondering how early you started sleep training or following specific guidelines surrounding wake/sleep hours. I have read the moms on call book that provides guidance on sleep training starting at 2 weeks, but a part of me feels like I want her to have some flexibility in wanting to nap longer than 2.5 hours if she is tired, etc

I'm curious how you guys have handled it with your newborns. Thanks for your help!